greaseball vs nigga

greaseball

noun
  • A person of Italian, Spanish, Portuguese, Greek, other Mediterranean, or Latin American descent. 

  • A biker, a tough. 

  • A rocker or metalhead, especially one who listens to 1950s rock and roll or 1980s thrash metal. 

  • A mechanic. 

nigga

noun
  • Any person, though chiefly male. 

  • A male as opposed to a female. 

  • A close and loyal friend. 

  • A black person (usually male), especially an African American. 

How often have the words greaseball and nigga occurred in a corpus of books? (source: Google Ngram Viewer )